Next.js でアプリ内フィードバックフォームを作る

app/
  (app)/
    projects/[id]/settings/page.tsx
  feedback/
    actions.ts
    feedback-form.tsx
lib/
  user.ts
.env.local

IKIFORM_SECRET_KEY=ik_sk_your_secret_key
SESSION_SECRET=the-secret-your-auth-already-uses

import "server-only";

import { cookies } from "next/headers";
import { cache } from "react";
import { decrypt } from "@/lib/session";

export interface User {
  id: string;
  email: string;
}

export const getUser = cache(async (): Promise<User | null> => {
  const token = (await cookies()).get("session")?.value;
  if (!token) return null;
  const session = await decrypt(token);
  return session?.userId ? { id: session.userId, email: session.email } : null;
});

"use server";

import { headers } from "next/headers";
import { getUser } from "@/lib/user";

export interface FeedbackState {
  status: "idle" | "sent" | "error";
  message: string;
  comment?: string;
}

const SCREEN = /^[a-z0-9/[\]._-]{1,120}$/;

function pageFrom(referer: string | null) {
  try {
    const url = new URL(referer ?? "");
    return url.origin + url.pathname;
  } catch {
    return "";
  }
}

export async function sendFeedback(_previous: FeedbackState, formData: FormData): Promise<FeedbackState> {
  const comment = String(formData.get("comment") ?? "").trim().slice(0, 4000);
  const user = await getUser();
  if (!user) return { status: "error", message: "Your session ended. Sign in again, then send it.", comment };

  const rating = Number(formData.get("rating"));
  if (!Number.isInteger(rating) || rating < 1 || rating > 5) {
    return { status: "error", message: "Pick a score from 1 to 5.", comment };
  }

  const request = await headers();
  const screen = String(formData.get("screen") ?? "");

  let response: Response;
  try {
    response = await fetch("https://ikiform.com/f/frm_xxxxxxxxxxxxxxxx", {
      method: "POST",
      headers: {
        Accept: "application/json",
        "Content-Type": "application/json",
        Authorization: `Bearer ${process.env.IKIFORM_SECRET_KEY}`,
        Origin: request.get("origin") ?? "",
      },
      body: JSON.stringify({
        rating,
        comment,
        page: pageFrom(request.get("referer")),
        screen: SCREEN.test(screen) ? screen : "unknown",
        user_id: user.id,
        email: user.email,
        _gotcha: String(formData.get("_gotcha") ?? ""),
      }),
      signal: AbortSignal.timeout(8000),
    });
  } catch {
    return { status: "error", message: "We couldn't send it. Try again in a moment.", comment };
  }

  const result = await response.json().catch(() => null);
  if (result?.ok) return { status: "sent", message: "Thanks. We read every one." };
  return {
    status: "error",
    message: result?.error?.fields?.comment?.[0] ?? result?.error?.message ?? "We couldn't send it. Try again.",
    comment,
  };
}

"use client";

import { useActionState } from "react";
import { type FeedbackState, sendFeedback } from "./actions";

const initial: FeedbackState = { status: "idle", message: "" };
const SCORES = ["Broken", "Frustrating", "Fine", "Good", "Great"];

export function FeedbackForm({ screen }: { screen: string }) {
  const [state, action, pending] = useActionState(sendFeedback, initial);

  if (state.status === "sent") return <p role="status">{state.message}</p>;

  return (
    <form action={action} aria-busy={pending}>
      <fieldset>
        <legend>How is this screen working for you?</legend>
        {SCORES.map((label, index) => (
          <label key={label}>
            <input type="radio" name="rating" value={index + 1} required /> {label}
          </label>
        ))}
      </fieldset>
      <label htmlFor="feedback-comment">What would make it better?</label>
      <textarea id="feedback-comment" name="comment" rows={4} maxLength={4000} defaultValue={state.comment} />
      <input type="hidden" name="screen" value={screen} />
      <input name="_gotcha" type="text" tabIndex={-1} autoComplete="off" hidden />
      {state.status === "error" ? <p role="alert">{state.message}</p> : null}
      <button disabled={pending}>{pending ? "Sending" : "Send feedback"}</button>
    </form>
  );
}

import { FeedbackForm } from "@/app/feedback/feedback-form";

export default function ProjectSettingsPage() {
  return (
    <main>
      <h1>Project settings</h1>
      <aside>
        <FeedbackForm screen="projects/[id]/settings" />
      </aside>
    </main>
  );
}